Electric Air Pump for Inflatable Body

ABSTRACT

An electric air pump for pumping air into an inflatable body includes a housing having an air inlet and an air outlet, an impeller disposed in the housing, a motor configured to drive the impeller, an air passage connecting the air inlet and the air outlet, a first chamber receiving the motor and including a ventilation inlet and ventilation outlet, and a heat dissipation impeller configured to be driven by the motor so that air flows into the first chamber through the ventilation inlet and flows out of the first chamber through the ventilation outlet for heat dissipation of the motor.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority of China Patent Application No. 201410600331.9, filed on Oct. 31, 2014, the entirety of which is incorporated by reference herein.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an electric air pump, and more particularly to an electric air pump for pumping air into inflatable bodies and provided with heat dissipation function.

2. Description of the Related Art

Electric air pumps are used for pumping air into inflatable bodies such as inflatable boats, inflatable beds, inflatable parks and inflatable arches. Referring to FIGS. 1 and 2, two conventional electric air pumps are shown. The conventional electric air pumps include a housing 1 having an air inlet 11 and an air outlet 12, a motor 2 disposed in the housing 1, and an impeller 3 connected to the motor 2 and driven by the motor 2. The impeller 3 rotates to drive air to flow into the housing 1 through the air inlet 11 and afterwards into the inflatable body A through the air outlet 12. When the air flows through the motor 2, the air flow can reduce temperature of the motor 2. However, when an air pressure in the inflatable body A is equal to or higher than an air pressure generated by the electric air pump, air stops entering the housing 1, and thus no air flow can dissipate heat generated by the motor 2. If the motor 2 continues to rotate, the temperature of the motor 2 may increase rapidly and finally causes damage. Although the problem can be solved by installing an over-temperature protector to prevent a higher temperature of motor 2, this solution increases cost. The over-temperature protector may frequently start and shut down the motor 2, thus the motor 2 cannot rotate continuously, which affects the stability and service life of the electric air pump.

BRIEF SUMMARY OF THE INVENTION

To address the shortcomings discussed, the invention provides an electric air pump capable of operating stably for a long period and having a long service life.

The invention provides an electric air pump. The electric air pump for pumping air into at least one inflatable body in accordance with an exemplary embodiment of the invention includes a housing having an air inlet and an air outlet, an impeller disposed in the housing, a motor configured to drive the impeller, an air passage connecting the air inlet and the air outlet, a first chamber receiving the motor and including a ventilation inlet and ventilation outlet, and a heat dissipation impeller configured to be driven by the motor so that air flows into the first chamber through the ventilation inlet and flows out of the first chamber through the ventilation outlet for heat dissipation of the motor.

In another exemplary embodiment, the ventilation inlet and the ventilation outlet are disposed on two sides of the first chamber.

In yet another exemplary embodiment, the electric air pump further includes a switching mechanism and a trigger switch, wherein the switching mechanism is disposed in the housing to pump air into the air passage, discharging air from the air passage, or closing the air passage, and the trigger switch is connected to the switching mechanism for starting or shutting down the motor.

In another exemplary embodiment, the electric air pump further includes a second chamber and a spacing plate. The switching mechanism includes a knob disposed on a surface of the housing, a transmission rod configured to be rotated with the knob, and a switching element disposed in the second chamber and configured to be driven by the transmission rod to change air flow direction. The second chamber is disposed in the housing and includes a right partition plate and a left partition plate. The right partition plate partitions the switching element and the impeller and has an upper through hole and a lower through hole. The left partition plate is disposed near the air outlet and has a left through hole connected to the air outlet. The spacing plate is disposed between the motor and the impeller to form an upper space connected to the upper through hole and a lower space connected to the lower through hole.

In yet another exemplary embodiment, the electric air pump further includes a rib disposed on the transmission rod, a transmission shaft movably extending through a through hole formed on the left partition plate, and a channel switching button fixed to the transmission shaft and including a transmission portion connected to the rib disposed on the transmission rod. The switching element includes a channel inclined between the left partition plate and the right partition plate, and a sliding plate disposed on an inner wall of the left partition plate and adjacent to the channel. A width of the channel is less than a distance between the upper through hole and the lower through hole and less than a height of the left through hole. The sliding plate is larger than the left through hole. The transmission rod is configured to drive the channel switching button to rotate about the transmission shaft through the rib and the transmission portion so as to rotate the switching element at a predetermined angle to connect the channel to the left through hole and the lower through hole.

In another exemplary embodiment, the transmission rod includes a protrusion configured to contact the trigger switch disposed near the protrusion.

In yet another exemplary embodiment, the electric air pump further includes a valve set disposed between the left through hole and the air outlet, a pressing plate disposed on the air outlet and covered by the valve set, a push rod disposed on a center of the pressing plate and extending towards the transmission rod, an elastic element disposed around the push rod to push the pressing plate to cover the air outlet, and two bosses disposed on the transmission rod, wherein the bosses push the push rod to open or close the air inlet through rotation of the transmission rod.

In another exemplary embodiment, the housing is hermetically connected to the inflatable body, and the electric air pump further includes a manual pressure relief valve disposed on an outer wall of the electric air pump and configured to discharge air from the inflatable body.

In yet another exemplary embodiment, the manual pressure relief valve includes a body fixed to the outer surface of the electric air pump. The body includes a vent, a valve deck plate covering the vent, a vertical rod disposed on a center of the valve deck plate and extending through the vent to protrude from the body, and a returning elastic element disposed around the vertical rod to push the valve deck plate to cover the vent.

In another exemplary embodiment, the electric air pump further includes a manual exhausting handle, a power switch configured to start the motor, a venting hole formed on the manual exhausting handle and connected to the inflatable body through a hose, a regulating plate configured to cover the venting hole and including a pressing rod which extends through the manual exhausting handle to protrude from an outer surface of the manual exhausting handle, and a returning elastic element disposed around the pressing rod to push the regulating plate to cover the venting hole.

In yet another exemplary embodiment, the first chamber and the air passage are separated.

In another exemplary embodiment, the first chamber is connected to the air passage.

In yet another exemplary embodiment, the ventilation outlet and the air outlet are separated.

The electric air pump of the invention can dissipate heat generated by the motor, whereby the motor can operate for a long time without any unstable, aged or safety problems. The electric air pump of the invention controls air inflation and discharge to depressurize the inflatable body manually when the inflatable body is over-pressurized and power inflate air into the inflatable body when the inflatable body is under-pressurized.

A detailed description is given in the following embodiments with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 is a cross section of a conventional electric air pump;

FIG. 2 is a cross section of another conventional electric air pump;

FIG. 3 is a cross section of the first embodiment of an electric air pump of the invention;

FIG. 4 is a cross section of the second embodiment of an electric air pump of the invention;

FIG. 5 is a cross section of the third embodiment of an electric air pump of the invention;

FIG. 6 is an exploded view of the fourth embodiment of an electric air pump of the invention;

FIG. 7 is a cross section of the fourth embodiment of an electric air pump of the invention showing that air is pumped into an inflatable body;

FIG. 8 is a perspective view of the fourth embodiment of an electric air pump of the invention showing a transmission rod, a channel switching button and a channel switching element when air is pumped into an inflatable body;

FIG. 9 is a perspective view of the fourth embodiment of an electric air pump of the invention showing a transmission rod and a channel switching button when air is pumped into an inflatable body;

FIG. 10 is a cross section of the fourth embodiment of an electric air pump of the invention showing that air is releasing from an inflatable body;

FIG. 11 is a perspective view of the fourth embodiment of an electric air pump of the invention showing a transmission rod, a channel switching button and a channel switching element when air is released from an inflatable body;

FIG. 12 is a perspective view of the fourth embodiment of an electric air pump of the invention showing a transmission rod and a channel switching button when air is released from an inflatable body;

FIG. 13 is a front view of the fourth embodiment of an electric air pump of the invention;

FIG. 14 is a cross section of a manual pressure relief valve of the fourth embodiment of an electric air pump of the invention showing the manual pressure relief valve is opened;

FIG. 15 is a cross section of a manual pressure relief valve of the fourth embodiment of an electric air pump of the invention showing the manual pressure relief valve is closed;

FIG. 16 is a cross section of a manual exhausting handle of the invention, wherein the manual exhausting handle is closed;

FIG. 17 is a cross section of a manual exhausting handle of FIG. 16, wherein the manual exhausting handle is opened; and

FIG. 18 is a cross section of a manual exhausting handle of FIG. 16 showing that the manual exhausting handle is mounted to a housing of an electric air pump of the invention.

DETAILED DESCRIPTION OF THE INVENTION

The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

The First Embodiment

Referring to FIG. 3, an electric air pump of the first embodiment is capable of pumping air into or releasing air from an inflatable body A such as an inflatable bed and an inflatable boat. The electric air pump includes a housing 1 having an air inlet 11 and an air outlet 12, a motor 2 disposed in the housing 1, an impeller 3 connected to the motor 2 and an air passage 4 connected to the air inlet 11 and the air outlet 12. The air inlet 11 is connected to atmosphere, and the air outlet 12 is connected to a port of the inflatable body A. Pressurized air flows from the housing 1 into the inflatable body A through the air inlet 12. The impeller 3 is rotated by the motor 2 to drive air to enter the housing 1 through the air inlet 11 and leave the housing 1 through the air outlet 12. A first chamber 5 is formed in the housing 1 to receive the motor 2. The air passage 4 is formed on a periphery of the housing 1 and separated from the first chamber 5 to prevent the air in the air passage 4 from heat generated by the motor 2, which may affect the use of the inflatable body A. The first chamber 5 includes a ventilation inlet 51 and a ventilation outlet 52 to dissipate heat generated by the motor 2. The ventilation inlet 51 and the ventilation outlet 52 are disposed on two sides of the first chamber 5. A heat dissipation impeller 53 is connected to a shaft of the motor 2 to drive air to flow into the first chamber 5. Air driven by the heat dissipation impeller 53 (indicated by solid arrows of FIG. 3) enters the first chamber 5 through the ventilation inlet 51 and flows through the motor 2 to absorb the heat generated by the motor 2. The heated air leaves the first chamber 5 through the ventilation outlet 52 to take the heat away. Since the first chamber 5 and the air passage 4 are separated and the ventilation outlet 52 and the air outlet 12 are separated, the air flow heated by the motor 2 does not affect the air flow in the air passage 4.

In this embodiment, as long as the electric air pump operates, the motors 2 is continuously cooled by air flow even when air pressure in the inflatable body is equal to or higher than air pressure generated by the electric air pump, and air stops entering the inflatable body. The motor 2 is prevented from overheating so that reliability and service life of the electric air pump are increased.

The Second Embodiment

Referring to FIG. 4, an electric air pump of this embodiment has the same functions and effects as the electric air pump of the first embodiment of FIG. 3. The electric air pump of FIG. 3 is a vertical type electric air pump, and the electric air pump of this embodiment is a horizontal type electric air pump. The air inlet, the motor, the impeller and the air outlet of the electric air pump of FIG. 3 are arranged in a line, wherein the air inlet and the air outlet are disposed on an upper end and a lower end of the housing, and the housing is perpendicularly connected to the inflatable body when the electric air pump pumps air into the inflatable body. The air inlet, the impeller and the air outlet of the electric air pump of FIG. 4 are arranged on one side of the first chamber 5, and the motor is perpendicular to the air passage. A thermal insulating layer 54 is disposed between the first chamber 5 and the air passage 4 to prevent heat generated by the motor 2 from transferring to the air passage 4. Because other elements of this embodiment of FIG. 4 have the same structure and effects as the elements of the first embodiment of FIG. 3, description for other elements of FIG. 4 are omitted.

The Third Embodiment

Referring to FIG. 5, an electric air pump of this embodiment has the same functions and effects as the electric air pump of the second embodiment of FIG. 4. The electric air pump of FIG. 4 is a horizontal type electric air pump, and the air inlet and the air outlet of FIG. 4 are arranged in a horizontal line. However, the air inlet 11 of FIG. 5 is disposed on a top of the housing 1, and the air outlet 12 is perpendicular to the air inlet 11. The embodiment of the electric air pump of FIG. 5 includes no thermal insulating layer. Because other elements of this embodiment of FIG. 5 have the same structure and effects as the elements of the second embodiment of FIG. 4, description for other elements of FIG. 5 are omitted.

The Fourth Embodiment

Referring to FIGS. 6-8, an electric air pump of this embodiment is integrated with an inflatable body to become attached. The electric air pump includes a housing 1 having an air inlet 11 and an air outlet 12, a motor 2 disposed in the housing 1, an impeller 3 driven by the motor 2 and an air passage 4 connecting the air inlet 11 and the air outlet 12. The impeller 3 is rotated by the motor 2 to drive air flow (indicated by hollow arrows of FIG. 7) to enter the housing 1 through the air inlet 11 and leave the housing 1 through the air outlet 12 and finally flow into the inflatable body A. A first chamber 5 receiving the motor 2 is formed in the housing 1, and the air passage 4 is disposed on one side of the first chamber 5. The first chamber 5 and the air passage 4 are separated to prevent heat generated by the motor 2 from heating the air in the air passage 4 so as to affect the use of the inflatable body A. The first chamber 5 includes a ventilation inlet 51 and a ventilation outlet 52 to dissipate heat generated by the motor 2. The ventilation inlet 51 and the ventilation outlet 52 are disposed on two sides of the first chamber 5. A heat dissipation impeller 53 is connected to a shaft of the motor 2 to drive air to flow into the first chamber 5. Air driven by the heat dissipation impeller 53 (indicated by solid arrows of FIG. 3) enters the first chamber 5 through the ventilation inlet 51 and flows through the motor 2 to absorb the heat generated by the motor 2. The heated air leaves the first chamber 5 through the ventilation outlet 52 to take the heat away. Since the first chamber 5 and the air passage 4 are separated and the ventilation outlet 52 and the air outlet 12 are also separated, the air flow heated by the motor 2 not only does not affect the air flow in the air passage 4, the heated air can also continue to be dissipated regardless of the flow of air in the air passage 4. In this embodiment, the housing 1 is hermetically connected to the inflatable body A. The majority of the housing 1 is disposed within the inflatable body A and only a cover 13 of the housing 1 is exposed.

A switching mechanism 6 is disposed in the air passage 4 to manually control air inflation, air discharge or closing of the air passage 4. The switching mechanism 6 is connected to a trigger switch 21 which is configured to start or shut down the motor 2. The switching mechanism 6 includes a knob 61 disposed on an outer surface of the housing 1, a transmission rod 62 rotated simultaneously with the knob 61 and a switching element 63 driven by the transmission rod 62 to control air flow directions. The knob 61 has three modes which are air inflation, air discharge and stop (as shown in FIG. 13). The switching element 63 is movably disposed in a second chamber 64 which is a part of the air passage 4. The second chamber 64 includes a right partition plate 65 separating the switching element 63 from the impeller 3 and a left partition plate 66 disposed near the air outlet 12. The right partition plate 65 has an upper through hole 651 and a lower through hole 652. A spacing plate 67 is disposed between the impeller 3 and the motor 2 to form an upper space 671 and a lower space 672. The upper space 671 is connected to the upper through hole 651, and the lower space 672 is connected to the lower through hole 652. The left partition plate 66 has a left through hole 661 connected to the air outlet 12. The switching element 63 includes a channel 631 inclined between the left partition plate 66 and the right partition plate 65. A sliding plate 632 is disposed on an inner wall of the left partition plate 66 and near the end of the channel 631 on the left partition plate 66. The channel 631 has a width less than a distance between the upper through hole 651 and the lower through hole 652 as well as less than a height of the left through hole 661. The sliding plate 632 has a size larger than the size of the left through hole 661. A transmission shaft 633 is disposed on a left side of the sliding plate 632 and extends through the left partition plate 66. The transmission shaft 633 movablly extends through a through hole 663 on the left partition plate 66. A channel switching button 634 is fixed to the transmission shaft 633 through a bolt 6342. The channel switching button 634 is fixed to the transmission shaft 633 at one end and has a transmission portion 6341 at the other end. The transmission rod 62 has a rib 621 corresponding to the transmission portion 6341. The transmission rod 62 rotates to rotate the channel switching button 634 with respect to transmission shaft 633 through the contact of the rib 621 and the transmission portion 6341 and rotate the switching element 63 to connect the channel 631 to the left through hole 661 and the lower through hole 652. The transmission rod 62 includes a protrusion 622 to contact the trigger switch 21 which is fixed in the housing 1 and disposed near the protrusion 622. A valve set 7 is disposed between the left through hole 661 and the air outlet 12. The valve set 7 includes a pressing plate 71 covering the air outlet 12, a push rod 72 extending from a center of the pressing plate 71 towards the transmission rod 62, and an elastic element 73 disposed around the push rod 72 to push the pressing plate 71 to cover the air outlet 12. Two bosses 623 are disposed on the transmission rod 62. The bosses 623 push the push rod 72 to open or close the air outlet 12 through rotation of the transmission rod 62.

When the knob 61 is rotated to the air inflation mode, the protrusion 622 on the transmission rod 62 contacts the trigger 21 to start the motor 2. At the same time, the bosses 623 on the transmission rod 62 push the push rod 72 to open the air outlet 12, and the transmission rod 62 rotates the channel switching button 634 and the switching element 63 to a predetermined angular displacement downwards through the rib 621, whereby air flow which enters the air passage 4 from the air inlet 11 flows through the upper through hole 651, the upper space 671, the lower space 672, the lower through hole 652, the channel 631, the left through hole 661, and the air outlet 12 into the inflatable body A. When the knob 61 is rotated to the air discharge mode, the protrusion 622 on the transmission rod 62 contacts the trigger switch 21 to start the motor 2. At the same time, the bosses 623 on the transmission rod 62 push the push rod 72 to open the air outlet 12, and the transmission rod 62 rotates the channel switching button 634 and the switching element 63 to a predetermined angular displacement upwards through the rib 621, whereby air in the inflatable body A flows through the left through hole 661, the channel 631, the upper space 671, the lower space 672 and the lower through hole 652 and discharges through the air inlet 11. When the knob 61 is rotated to the stop mode, the protrusion 622 is detached from the trigger switch 21 to shut down the motor 2, and the bosses 623 have no contact with the push rod 72, whereby the pressing plate 71 covers the air outlet 12 to close the air outlet 12.

A manual pressure relief valve 8 is disposed on the housing 1 to regulate the pressure in the inflatable body.

FIGS. 14 and 15 depict the portion B of FIG. 7 and the portion C of FIG. 10, respectively. As shown, the manual pressure relief valve 8 includes a body 81 fixed to an outer wall of the housing 1, a vent 82 formed on the body 81, a valve deck plate 83 covering the vent 82, and a vertical rod 84 vertically extending from a center of the valve deck plate 83. The vertical rod 84 extends through the vent 82 and can protrude from the body 81. The manual pressure relief valve 8 further includes a returning elastic element 85 disposed around the vertical rod 84 to push the valve deck plate 83 to cover the vent 82. When the inflatable body is over-pressurized, the vertical rod 84 is pushed to open the vent 82, and the air in the inflatable body discharges to reduce the air pressure therein. When the vertical rod 84 is released, the returning elastic element 85 pulls the valve deck plate 83 to cover the vent 82 again so as to close the vent 82 and stop the discharge.

Referring to FIGS. 16, 17 and 18, a manual exhausting handle 9 is used to regulate the air pressure in the inflatable body A in another embodiment. The manual exhausting handle 9 includes a power switch 91 starting or shutting down the motor 2, a venting hole 92 formed on the manual exhausting handle 9 and connected to the inflatable body through a hose 93, and a regulating plate 94 configured to cover the venting hole 92. The regulating plate 94 includes a pressing rod 95 which extends into the manual exhausting handle 9 and is capable of protruding from an outer surface of the manual exhausting handle 9. A returning elastic element 96 is disposed around the pressing rod 95 to push the regulating plate 94 to cover the venting hole 92. When the inflatable body is over-pressurized, the pressing rod 95 is pushed to open the venting hole 92, and the air in the inflatable body discharges through the hose 93 and the venting hole 92 to reduce the air pressure therein. When the pressing rod 95 is released, the returning elastic element 96 moves the regulating plate 94 to cover the venting hole 92 again so as to close the venting hole 92 and stop the discharge.

In the above embodiments, gas sealing between elements is necessary, and conventional means for gas sealing may be used. Thus, the description of means for gas sealing is omitted.

The first chamber 5 and the air passage 4 are separated in the above embodiments. However, it is understood that a connection between the first chamber 5 and the air passage 4 is feasible when heat generated by the electric air pump is not too much and does not affect the use of the inflatable body A. The first chamber 5 and the air passage 4 can be connected in different manners. For example, the first chamber 5 and the air passage 4 have no separating element provided therebetween. For another example, the first chamber 5 and the air passage 4 has a separating element provided therebetween. However, the separating element has a through hole to connect the first chamber 5 and the air passage 4.

While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements. 

What is claimed is:
 1. An electric air pump for pumping air into an inflatable body, comprising: a housing comprising an air inlet and an air outlet; an impeller disposed in the housing; a motor configured to drive the impeller; an air passage connecting the air inlet and the air outlet; a first chamber receiving the motor and comprising a ventilation inlet and a ventilation outlet; and a heat dissipation impeller configured to be driven by the motor so that air flows into the first chamber through the ventilation inlet and flows out of the first chamber through the ventilation outlet for heat dissipation of the motor.
 2. The electric air pump as claimed in claim 1, wherein the ventilation inlet and the ventilation outlet are disposed on two sides of the first chamber.
 3. The electric air pump as claimed in claim 2, further comprising a switching mechanism and a trigger switch, wherein the switching mechanism is disposed in the housing to pump air into the air passage, discharging air from the air passage, or closing the air passage, and the trigger switch is connected to the switching mechanism for starting or shutting down the motor.
 4. The electric air pump as claimed in claim 3, further comprising a second chamber and a spacing plate, wherein the switching mechanism comprises a knob disposed on a surface of the housing, a transmission rod configured to be rotated with the knob, and a switching element disposed in the second chamber and configured to be driven by the transmission rod to change air flow direction, the second chamber is disposed in the housing and comprises a right partition plate and a left partition plate, the right partition plate partitions the switching element and the impeller and has an upper through hole and a lower through hole, the left partition plate is disposed near the air outlet and has a left through hole connected to the air outlet, and the spacing plate is disposed between the motor and the impeller to form an upper space connected to the upper through hole and a lower space connected to the lower through hole.
 5. The electric air pump as claimed in claim 4, further comprising a rib disposed on the transmission rod, a transmission shaft movably extending through a through hole formed on the left partition plate, and a channel switching button fixed to the transmission shaft and comprising a transmission portion connected to the rib disposed on the transmission rod, wherein the switching element comprises a channel inclined between the left partition plate and the right partition plate, and a sliding plate disposed on an inner wall of the left partition plate and adjacent to the channel, a width of the channel is less than a distance between the upper through hole and the lower through hole and less than a height of the left through hole, the sliding plate is larger than the left through hole, the transmission rod is configured to drive the channel switching button to rotate about the transmission shaft through the rib and the transmission portion so as to rotate the switching element at a predetermined angle to connect the channel to the left through hole and the lower through hole.
 6. The electric air pump as claimed in claim 5, wherein the transmission rod comprises a protrusion configured to contact the trigger switch disposed near the protrusion.
 7. The electric air pump as claimed in claim 5 further comprising a valve set disposed between the left through hole and the air outlet, a pressing plate disposed on the air outlet and covered by the valve set, a push rod disposed on a center of the pressing plate and extending towards the transmission rod, an elastic element disposed around the push rod to push the pressing plate to cover the air outlet, and two bosses disposed on the transmission rod, wherein the bosses push the push rod to open or close the air inlet through rotation of the transmission rod.
 8. The electric air pump as claimed in claim 1, wherein the housing is hermetically connected to the inflatable body, and the electric air pump further comprises a manual pressure relief valve disposed on an outer wall of the electric air pump and configured to discharge air from the inflatable body.
 9. The electric air pump as claimed in claim 8, wherein the manual pressure relief valve comprises a body fixed to the outer surface of the electric air pump, and the body comprises a vent, a valve deck plate covering the vent, a vertical rod disposed on a center of the valve deck plate and extending through the vent to protrude from the body, and a returning elastic element disposed around the vertical rod to push the valve deck plate to cover the vent.
 10. The electric air pump as claimed in claim 1, further comprising a manual exhausting handle, a power switch configured to start the motor, a venting hole formed on the manual exhausting handle and connected to the inflatable body through a hose, a regulating plate configured to cover the venting hole and comprising a pressing rod which extends through the manual exhausting handle to protrude from an outer surface of the manual exhausting handle, and a returning elastic element disposed around the pressing rod to push the regulating plate to cover the venting hole.
 11. The electric air pump as claimed in claim 1, wherein the first chamber and the air passage are separated.
 12. The electric air pump as claimed in claim 1, wherein the first chamber is connected to the air passage.
 13. The electric air pump as claimed in claim 1, wherein the ventilation outlet and the air outlet are separated. 